package com.yy.filter;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.yy.entity.front.User;
import com.yy.utils.BaseContext;
import com.yy.utils.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.annotation.Resource;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Map;

/**
 * create by KongFuning on 2022/7/30
 */
// 检查用户是否已经完成登录
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    // 路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1、获取本次请求的URI
        String requestURI = request.getRequestURI();

        // 定义不需要处理的请求路径
        String[] urls = new String[]{
            "/employee/login",
            "/employee/logout",
            "/backend/**",
            "/front/**",
            "/common/**",
            "/user/code",
            "/user/login"
        };

        // 2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        // 3、如果不需要处理，则直接放行
        if(check){
            filterChain.doFilter(request,response);
            return;
        }

        // 4-1、判断用户登录状态：如果已登录，则直接放行
        String employeeId = (String) request.getSession().getAttribute("employee");
        BaseContext.setCurrentId(employeeId);

        if(StrUtil.isNotEmpty(employeeId)){
            filterChain.doFilter(request,response);
            return;
        }

        // 4-2、判断用户登录状态：如果已登录，则直接放行
        String userId = (String) request.getSession().getAttribute("user");
        BaseContext.setCurrentId(userId);

        if(StrUtil.isNotEmpty(userId)){
            filterChain.doFilter(request,response);
            return;
        }

        // 5、如果未登录则返回未登录页面，通过输出流方式向客户端界面响应数据

        response.getWriter().write(JSONUtil.toJsonStr(R.error("NOTLOGIN")));
        return ;
    }

    // 路径匹配，检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }


}
